1 files changed, 15 insertions, 0 deletions
diff --git a/testing/web-platform/tests/service-workers/service-worker/resources/interfaces.js b/testing/web-platform/tests/service-workers/service-worker/resources/interfaces.js
new file mode 100644
index 000000000..eb00df65f
--- /dev/null
+++ b/testing/web-platform/tests/service-workers/service-worker/resources/interfaces.js
@@ -0,0 +1,15 @@
+function verify_interface(name, instance, attributes) {
+  assert_true(name in self,
+              name + ' should be an defined type');
+  if (instance) {
+    assert_true(instance instanceof self[name],
+                instance + ' should be an instance of ' + name);
+    Object.keys(attributes || {}).forEach(function(attribute) {
+        var type = attributes[attribute];
+        assert_true(attribute in instance,
+                    attribute + ' should be an attribute of ' + name);
+        assert_equals(typeof instance[attribute], type,
+                      attribute + ' should be of type ' + type);
+      });
+  }
+}